The latest GreenHeart device - Aspen (pictured above) - continues the woodland-inspired naming convention of its eco cousins, Hazel and Elm, however this device is the first smartphone in the range, running version 6.5.3 of Microsoft's Windows Mobile OS.

In a have-your-cake-and-eat-it-twist, Aspen has both physical Qwerty and a 2.4-inch touchscreen up top.

Image credit: Sony Ericsson

Published: February 9, 2010 -- 15:17 GMT (07:17 PST)

Caption by: Natasha Lomas

The HSPA device is 117 x 60 x 12.45mm and weighs in at 130g. It has wi-fi, Bluetooth and a 3.2-megapixel camera.

There's a choice of two colours: black or silver.

Image credit: Sony Ericsson

Published: February 9, 2010 -- 15:17 GMT (07:17 PST)

Caption by: Natasha Lomas

Like Sony Ericsson's other forays into Windows Mobile - the Xperia X1 and X2 - the Aspen has customisable panels which sit on top of the UI, offering users the ability to run applications such as Skype, Facebook and YouTube straight off the desktop with one click.

Sony Ericsson said Aspen will be available in "selected markets" in the second quarter of this year.

The latest GreenHeart device - Aspen (pictured above) - continues the woodland-inspired naming convention of its eco cousins, Hazel and Elm, however this device is the first smartphone in the range, running version 6.5.3 of Microsoft's Windows Mobile OS.

In a have-your-cake-and-eat-it-twist, Aspen has both physical Qwerty and a 2.4-inch touchscreen up top.